利用微弧氧化技术在Ti6Al4V合金表面制备含钙、磷的多孔TiO_2涂层(记为MAO),并对涂层进行碱热处理(记为MAONH).结果表明:MAONH膜层的相结构和MAO膜层的大有不同,它主要由TiO_2(金红石型和锐钛矿型)、钛酸钙相组成.钙和磷离子在MAONH膜层表面比在MAO膜层表面更容易沉积,其原因是钛酸钙在模拟体液浸泡时发生水解,生成大量的Ca~(2+)和OH~- 离子,Na~+和OH~-离子同模拟体液中的Ca~(2+)和PO_4~(3-)离子发生离子交换,导致磷灰石在MAONH膜层表面沉积.
Porous TiO_2 coating containing calcium and phosphate was prepared on Ti6Al4V alloy substrate using micro-arc oxidation, which was termed as MAO. And the MAO coating was treated by alkali and annealing, which was termed as MAONH. The morphology, element content and phase composition of the two kinds of coatings were analyzed by SEM, EDS and XRD, respectively. The results show that the MAONH coating is mainly composed of anatase, rutile and CaTiO_3 phases, which is very different from the MAO coating. It is found that Ca~(2+) and P~(5+) ion deposit on the MAONH coating more easily than that on the MAO coating. The reason could be the hydrolysis of CaTiO_3 soaking in Hank's solution, which results in abundant Ca~(2+) and OH~- ions. The apatite is deposited on the MAONH coating by ionic exchanges between OH~-, Na~+ ions of the MAONH coating and Ca~(2+), PO_4~(3-) ions in the Hank's solution.
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